Power-supply unit for radio sets



Nov. 6, 1928.

-' F. DE WILL Y POWER SUPPLYUNITFOR RADIO sET;

OriginalFild July 2, 1926 INVENTOR BY m (12.16%

. 4170M if Patented Nov. 6, 1928 I UNITED STATES PATENT OFFICE.

IRANCIS as WILLY. OF NEW YORK, N. Y.

POWER-SUPPLY UNIT FOR RADIO SETS.

- Application filed July 2, 1926, SerialNo 120,029. Renewed September 27, .1928.

This invention relates generally to power Fig. 2 differs from Fig. 1 inasmuch as the 45 supply units for radio sets, and has more partube 14 used in Fig. 1 is for rectification of ticular reference to a novel means for elimifull waves, while to accomplish this purpose nating noises in the said units. in Fig. 2 two tubes 14 are used. each having The invention has for an object the provia filament 19 connected in series with each sion of an improved device of the class deother. scribed which will operate very ctliciently, Referring to Fig. 3, the absorbing winding and which can be manufactured and sold at a 16 is shown as placed on winding 10, while 1 t, winding 12 is placed on 16, and 18 on 12, but

For further comprehension of the inventhe invention is not limited to this particular tion,and of the objects and advantages thereorder. The absorbing winding 16 may be 55 of, reference will be had to the following placed between windings 12 and 18, or any'dedescription and accompnaying drawing, and sirable position. to the appended claim in which the various The use of an absorbing winding, as denovel features of the invention are more parscribed greatly reduces the noises produced ticularly set forth. by such instruments, such noises presumably 60 Referring to the drawing forming a matebeing due to distorted interfering elcctromorial part of this disclosure two forces.

Fig. 1 is a schematic wiring diagram of a While I have illustrated and described my power supply unit with associated connecinvention with some degree of particularity,

tions, and the invention applied thereto. I realize that in practice various alterations 65 Fig. 2 is a schematic wiring dia ram of therein may be made. I therefore reserve the another power supply unit, specifically of the right and privilege of changing the form of two tube type, :with associated connections. the details of construction or otherwise alter- 5 and the invention applied thereto. ing the arrangement of the correlated parts,

Fig. 3 is a sectional view of a coil arranged without departing from the spirit or the 7 according to the invention. scope of the appended claim.

Referring in particular to Fig. 1, the refer- Having thus described my invention, what once numeral 10 indicates the primary wind- I claim as row, and desire to secure by United ing, which is connected to a source of power,v States Letters Patent is preferably a 110 volt A. C. source. The pri- In a device of the class described, the com- 7;, mary winding is wound on a suitable core 11, bination with a core having a primary wind as shown in Fig. 3. The secondary winding ing adapted to be connected to a source of 12 h it e d c nnected to the plates 13 electrical power, a secondary winding on the of the vacuum tube 14, and shunted across the primary winding, and shunted across the said plates 13, is a circuit including condensplates of a rectifying tube, of a circuit shunt- '0 ers-15 and 15, preferably of 2 u f capacity, ed across the plates of the rectifying tube, the and a shielding or absorbing coil 16. T he said circuit including condensers and a lead 17 is tapped to the secondary winding shielding coil, and the said shielding coil beand connects to the A or -13 terminal of a inglplaced between the said primary and secradio set.. Another secondary coil 18 is in a ary windings. 85 Circuit including the filaments 19, while lead In testimony whereof I have affixed my sig- 20 branches therefrom and connects to the nature.

1 A 0r +-B terminal of a radio set. FRANCIS on WILLY. 

